100 lines
3.4 KiB
Plaintext
100 lines
3.4 KiB
Plaintext
# pour two types of particles (cohesive and non-cohesive) into cylinder
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# 'turn' cylinder by changing direction of gravity, then rotate it.
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# This simulates a rotating drum powder characterization experiment.
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variable name string rotating_drum_two_types
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atom_style sphere
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units lj
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###############################################
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# Geometry-related parameters
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###############################################
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variable boxx equal 30
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variable boxy equal 30
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variable boxz equal 50
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variable drum_rad equal ${boxx}*0.5
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variable drum_height equal 20
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variable xc equal 0.5*${boxx}
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variable yc equal 0.5*${boxx}
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variable zc equal 0.5*${boxz}
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###############################################
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# Particle-related parameters
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###############################################
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variable rlo equal 0.25
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variable rhi equal 0.5
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variable dlo equal 2.0*${rlo}
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variable dhi equal 2.0*${rhi}
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variable cyl_rad_inner equal ${drum_rad}-1.1*${rhi}
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variable dens equal 1.0
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variable skin equal 0.4*${rhi}
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#############
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processors * * 1
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region boxreg block 0 ${boxx} 0 ${boxy} 0 ${boxz}
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create_box 2 boxreg
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change_box all boundary p p f
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pair_style granular
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pair_coeff 1 * hertz/material 1e5 0.2 0.3 tangential mindlin NULL 1.0 0.5 damping tsuji
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pair_coeff 2 2 jkr 1e5 0.1 0.3 50 tangential mindlin NULL 1.0 0.5 rolling sds 1e3 1e3 0.1 twisting marshall
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variable theta equal 0
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region curved_wall cylinder z ${xc} ${yc} ${drum_rad} 0 ${drum_height} side in rotate v_theta ${xc} ${yc} 0 0 0 1
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region bottom_wall plane ${xc} ${yc} 0 0 0 1 side in rotate v_theta ${xc} ${yc} 0 0 0 1
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region insreg cylinder z ${xc} ${yc} ${cyl_rad_inner} ${drum_height} ${boxz}
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fix 0 all balance 100 1.0 shift xy 5 1.1
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fix 1 all nve/sphere
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fix grav all gravity 10 vector 0 0 -1
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fix ins1 all pour 2000 1 1234 region insreg diam range ${dlo} ${dhi} dens ${dens} ${dens}
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fix ins2 all pour 2000 2 1234 region insreg diam range ${dlo} ${dhi} dens ${dens} ${dens}
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comm_modify vel yes
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neighbor ${skin} bin
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neigh_modify delay 0 every 1 check yes
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fix 3 all wall/gran/region granular hertz/material 1e5 0.1 0.3 tangential mindlin NULL 1.0 0.5 damping tsuji region curved_wall
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fix 4 all wall/gran/region granular hertz/material 1e5 0.1 0.3 tangential mindlin NULL 1.0 0.5 damping tsuji region bottom_wall
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thermo_style custom step atoms ke v_theta
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thermo_modify lost warn
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thermo 100
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timestep 0.001
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#dump 1 all custom 100 ${name}.dump id type radius mass x y z
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#For removal later
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compute 1 all property/atom radius
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variable zmax atom z+c_1>0.5*${drum_height}
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group delgroup dynamic all var zmax every 10000
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run 2000
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#Remove any particles that are above z > 0.5*drum_height
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delete_atoms group delgroup
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#Add top lid
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region top_wall plane ${xc} ${yc} ${drum_height} 0 0 -1 side in rotate v_theta ${xc} ${yc} 0 0 0 1
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fix 5 all wall/gran/region granular hertz/material 1e5 0.1 0.3 tangential mindlin NULL 1.0 0.5 damping tsuji region top_wall
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# 'Turn' drum by switching the direction of gravity
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unfix grav
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unfix ins1
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unfix ins2
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fix grav all gravity 10 vector 0 -1 0
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variable theta equal 2*PI*elapsed/20000.0
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run 3000
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